Ringing voltage transfer circuit
US4201897A · kind A · utility
4Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1978 |
| Grant date | May 6, 1980 |
| Priority date | — |
| Expiry date | Nov 24, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/026
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A circuit which prepares a conductive path between a ringing voltage generator and a telephone subscriber loop circuit prior to the application of ringing voltage to the conductive path. Photo coupled switching and monitoring circuits are used to coordinate application of ringing voltage with operation of a ring relay which completes the circuit path between the ringing voltage generator and the loop circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.